Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b6edfc7a769da…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 05:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7965607e9a59a8c7db86a829db3224e0 SHA-1: add893d2fb69f12d00dc3944d6d2b145ec07c7c5 SHA-256: c52b6edfc7a769da54e8684688fbc46e7f96158d719d57c7374194f4a1315c11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a phishing or malware distribution lure. It contains numerous external links, with several pointing to compromised CMS upload directories, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://amatnieks.com/pictures/image/jikofomebop.pdf
    • http://pogservice.ru/userfiles/file/83748859892.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8fb6f0b1ca0f49c0a67063cf86d3ec64/noxixawupan.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160984b917405c---20741328502.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/44576b37c383cf59c672a03b27525eb9/bezejugavefab.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce1ab686b---79787717873.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4a9160b6e---pumuwuruvodadani.pdf
    • http://riskhedgetech.com/uploaded/file/19873394856098e1563ede5.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sj2hh4ode7ojf4afl1qoja86a1/zudemewuged.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/41de6e6138fb2d84721229e58ed29dac/7698812065.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077685d833ea---75547699316.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f9acd01a---33798799075.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/53011585711.pdf
    • http://novichiha.ru/pic/file/96081611460.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210618025530.pdf
    • https://luyenthitoeic.info/userfiles/file/xefurilogifuvilakilo.pdf
    • https://smsenerji.com/resimler/files/3904437973.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tke82fqe7fa086jqt71dq5ift7/palokajetezesuj.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/df0ff6d3f826f853339e0c3824a318c2/nibel.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3bd04e8d---65160493270.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3c530a733e537167208646f5abdc410a/57311118676.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0h8ui1tj0iarl0j5dro4s0knc9/kefevujurofojifesaniwuxi.pdf
    • http://kotolantopeni.cz/file/23638589536.pdf
    • http://pileshoppen.dk/userfiles/file/16249794435.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=let+us+c+solutions+by+yashwant+kanetkar+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5f.bin
b9331e1965f70e6053f109c4244a727450064edbc2be0bd577fbe4b866e1ea00
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 11208 bytes
font_01_sfnt_off00010466.bin
470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555
pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 16352 bytes
font_02_sfnt_off00011a70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
font_03_sfnt_off00013282.bin
a7a9dd519236c0aba013ebb9389c099610efd47f1c3a5368915992fbc33ec82a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 17400 bytes